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| Parameter | Unit | CTW-TIG251i | CTW-TIG250i |
| Input voltage | Volt | AC220±15% | AC415±15% |
| Phase | No | 1 | 3 |
| Frequency | Hz | 50/60 | 50/60 |
| Max input KVA@100% duty cycle | KVA | 6.8 | 7 |
| Open circuit voltage | Volts DC | 78 | 78 |
| Welding current range (TIG Mode) | Amps DC | 5-250 | 5-250 |
| Welding current range (MMA Mode) | Amps DC | 10-250 | 10-250 |
| Welding current @60% duty cycle | Amps | 250 | 250 |
| Welding current @100% duty cycle | Amps | 195 | 195 |
| Efficiency | % | 85 | 85 |
| Degree of protection | Class | IP23S | IP23S |
| Insulation | Class | H | H |
| Generator compatible | – | Yes | Yes |
| Suitable electrode diameter | mm Φ | 1.6, 2.5, 3.2, 4 | 1.6, 2.5, 3.2, 4 |
| Protections | – | Over voltage, under voltage, over temperature | Over voltage, under voltage, over temperature |
| Cooling | Type | Forced Air | Forced Air |
| Dimensions (LxWxH) | mm | 480x204x303 | 480x204x303 |
| Weight (approx) | Kg | 9.5 | 9.5 |